AP Statistics Probability

A fair coin has come up "heads" 10 times in a row.  The probability that the coin will come up heads on the next flip is:

• greater than 50%, it's due to happen.

• 50%

• less than 50%, since tails is happening so much.

• Can't be determined

According to the National Telecommunication and Information Administration, 50.5% of U.S. households had internet access in 2001.  What is the probability that four randomly selected U.S. all had internet access in 2001?

• 6.5%

• 12.6%

• 49.5%

• 50.5%

Pepsi is running a sales promotion in which 12% of all bottles have a "FREE" logo under the cap.  If you buy a 6-pack of bottles, what is the probability that you will find at least 1 "FREE" logo?

• .464

• .536

• .12

• 0

An ice cream stand owner reports that 12% of the cones they sell are "JUMBO" size.  You want to see what a "JUMBO" cone looks like so you stand and watch the sales for a while.  What is the probability that the first "JUMBO" cone is the fourth cone you see them sell?

• 8%

• 33%

• 40%

• 60%

100 people were surveyed.  54 were female, and 46 were male.  33 of the females said they were democrats, and 30 of the males said they were republicans.  If a person is randomly selected, what is the probability that its a democrat?

• 49%

• 46%

• 54%

• 51%

100 people were surveyed.  54 were female, and 46 were male.  33 of the females said they were democrats, and 30 of the males said they were republicans.  If two people are randomly selected, what is the probability they are both males?

• .30

• .46

• .25

• .21

100 people were surveyed.  54 were female, and 46 were male.  33 of the females said they were democrats, and 30 of the males said they were republicans.  If a person is randomly selected, what is the probability a male is chosen GIVEN THAT its a republican?

• .59

• .65

• .35

• .41

What is the probability that a female is chose given they like a Toyota? 

• .525

• .4627

• .6774

• .3143

Find P( Female | Part-time) =

• 15/31

• 43/71

• 31/43

• 15/43

If A and B are mutually exclusive, which statement below must be true?

• P(A∩B) = 0

• P(A|B) = 0

• P(A∪B) = 0

• P(A) + P(B) = 1